Garden calculators that show their work.
Bed plans, planting dates, spacing, soil and fences, worked out for your own garden, with the formula and sources on every page.
60 lettuce at 9 in, staggered
Planting
Lay out your beds, find your frost dates and seed starting schedule, and work out how many plants your household needs, all from published extension guidance.
All 17 planting calculatorsRaised Bed Planner
Lay out your raised beds in 1 ft squares and get plant counts, a shopping list, soil and water for the whole plan.
Seed Starting Calculator
Your frost dates turned into a sowing calendar: start indoors, harden off, transplant and sow dates for every crop you grow.
Plant Spacing Calculator
Pick a crop or a spacing and see how many plants fit your bed, row, circle or acre, in square, triangular or rows.
Square Foot Gardening Calculator
Tap squares to plant a 4 x 4 or 4 x 8 bed, see how many plants each crop takes per square, and print the chart.
Garden Size Calculator
Enter your household and crops to get plants per person, row feet, bed area, 4 x 8 beds and expected harvest.
Crop guides
Pick a crop to see how far apart to plant it, how many fit your bed, row or hedge, when to start the seeds and how many plants feed your household.
All 53 crop guides calculatorsGarlic Spacing Calculator
How far apart to plant garlic, and how many fit your bed, row or area.
Tomato Spacing Calculator
How far apart to plant tomatoes, and how many fit your bed, row or area.
When to Start Tomato Seeds
Dates to start tomatoes indoors, harden off and plant out for your ZIP code or zone.
How Many Strawberry Plants per Person
Plants, row feet and bed space of strawberries for your household.
Soil & mulch
Bulk material is sold by the cubic yard and bagged material by the cubic foot. These calculators turn your bed measurements into both, so you order once.
All 4 soil & mulch calculatorsRaised Bed Soil Calculator
Add your beds, pick a mix and get cubic feet, bags, cost and a lumber or block list for the frames.
Potting Soil Calculator
List your containers and see the potting mix they hold and the bags to buy.
Mulch Calculator
Enter your bed and depth to see cubic yards for bulk delivery or the number of bags to buy.
Garden Soil Calculator
Enter a bed's area and depth to see cubic yards for delivery or the bags to buy.
Fencing
Measure the line or draw it on a satellite map, pick the fence, and get posts, rails, pickets or panels, concrete bags and a cost range.
All 35 fencing calculatorsFence Calculator
Measure or draw your fence line, pick the fence, and get every post, rail, board and bag of concrete, plus a cost range.
Fence Post Depth Calculator
Enter the fence height, post and soil to see how deep to dig, why, and which post length to buy.
Fence Cost Calculator
Enter or draw your fence line and see the installed price range, cost per foot and DIY materials for every common fence material.
Picket Fence Calculator
Get every picket, rail and post for your fence, plus the exact picket spacing that gives equal gaps between two posts.
Farm Fence Calculator
Choose the animal and fence type, enter acres or draw the pasture, and get T-posts, wood brace posts, wire rolls, gates and a cost range.
Numbers you can trace back.
How we calculateSources you can check
Every calculator lists the extension service guides its numbers come from.
Feet or metres
Switch units at any time. Your measurements convert with you.
Reviewed and dated
Each page shows when our editors last checked it.